Overview
The LM3526MX-L/NOPB, produced by Texas Instruments, is a dual-port USB power switch and over-current protection device. It is designed to provide power switching and protection for USB host applications, including notebook and desktop PCs, USB root hubs, and other self-powered USB hub devices. This device is compatible with both USB 1.1 and USB 2.0 standards and offers features such as smooth turn-on to eliminate in-rush induced voltage drops and thermal shutdown to protect the device from excessive power dissipation.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Input Voltage Range | 2.7 | 5.5 | V | |
| On Resistance (RON) | 100 | 140 | mΩ | |
| Continuous Output Current | 0.5 | A | ||
| Short Circuit Output Current | 0.5 | 1.2 | A | |
| Over-current Threshold | 2.2 | 3.2 | A | |
| Standby Current | 1 | µA | ||
| Operating Current | 200 | µA | ||
| Under-voltage Lockout (UVLO) Threshold | 1.8 | V | ||
| Thermal Shutdown Temperature | 145 | 150 | °C | |
| Package Type | SOIC-8 |
Key Features
- Compatible with USB 1.1 and USB 2.0 standards
- Dual-port device ideal for notebook and desktop PCs, and other self-powered USB hub devices
- Smooth turn-on to eliminate in-rush induced voltage drops
- 1 ms fault flag delay to filter hot-plug events and prevent erroneous overcurrent reporting
- Thermal shutdown to protect the device from excessive power dissipation
- Under-voltage lockout (UVLO) to prevent the MOSFET switch from turning on until the input voltage exceeds 1.8V
- Small SOIC-8 package to minimize board space
- Low on-resistance (RON) of 100 mΩ to 140 mΩ
- Low standby current of 1 µA
Applications
- Universal Serial Bus (USB) root hubs, including desktop and notebook PCs
- USB monitor hubs
- Other self-powered USB hub devices
- High power USB devices requiring in-rush limiting
- General purpose high side switch applications
Q & A
- What is the input voltage range of the LM3526MX-L/NOPB?
The input voltage range is from 2.7V to 5.5V.
- What is the maximum continuous output current per switch?
The maximum continuous output current per switch is 0.5A.
- What is the over-current threshold of the LM3526MX-L/NOPB?
The over-current threshold is between 2.2A and 3.2A.
- Does the LM3526MX-L/NOPB have thermal shutdown protection?
Yes, it has a two-stage thermal protection circuit that turns off the switches if the device temperature exceeds 145°C and activates both fault flags if the temperature exceeds 150°C.
- What is the package type of the LM3526MX-L/NOPB?
The package type is SOIC-8.
- What is the purpose of the 1 ms fault flag delay in the LM3526MX-L/NOPB?
The 1 ms fault flag delay filters hot-plug events and prevents erroneous overcurrent reporting caused by in-rush currents during hot-plug events.
- Is the LM3526MX-L/NOPB compatible with both USB 1.1 and USB 2.0 standards?
Yes, it is compatible with both USB 1.1 and USB 2.0 standards.
- What is the under-voltage lockout (UVLO) threshold of the LM3526MX-L/NOPB?
The UVLO threshold is typically 1.8V.
- What are some typical applications of the LM3526MX-L/NOPB?
Typical applications include USB root hubs, USB monitor hubs, self-powered USB hub devices, and high power USB devices requiring in-rush limiting.
- How does the LM3526MX-L/NOPB handle short-circuit conditions?
In a short-circuit condition, the switch dissipating excessive heat is turned off, allowing the second switch to continue functioning. If the die temperature rises above 150°C, both switches are turned off and both fault flag outputs are activated.
